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Year : 2002  |  Volume : 3  |  Issue : 1  |  Page : 3

Technology-A: Tissue doppler imaging in coronary artery disease

Division of Cardiovascular Diseases and, Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA

Correspondence Address:
Steve R Ommen
Mayo Clinic, 200 First Street SW, Rochester, MN 55905
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Source of Support: None, Conflict of Interest: None

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Tissue Doppler imaging (TDI) has rapidly evolved over the last decade as a sensitive clinical tool of measuring both global and regional myocardial velocities and their relationship to the cardiac cycle with high spatial and temporal resolution. Measurement of mitral annular velocities reflects global left ventricular LV function at rest or during stress echocardiography. Regional analysis of peak segmental systolic myocardial velocities during stress improves accuracy of novice readers, of interpreting basal segments, and concordance between observers. Moreover, it has higher sensitivity and comparable specificity to standard dobutamine stress echocardiography in detecting myocardial viability. Myocardial velocity gradient, being independent of cardiac translational movement, has also shown promise for detecting resting and induced ischemia and viable myocardium. Strain rate imaging (SRI), based on tissue Doppler technology, has clinical potential of quantitative assessment of regional contractility and function during stress echocardiography. Abnormal wall motion during isovolumic contraction and relaxation periods and their clinical implications of correlating myocardial viability has been discussed. Improved data acquisition and rapid post-processing of TDI will facilitate its incorporation into standard regional myocardial assessment.

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